Willfully falling foul of this law, the fabled duo were spotted squatting by eagle-eyed observers at the Kahlitna Base Camp on the mountain - who promptly ratted them out to the climbing ranger on duty late last month . . .

U.S. author Jon Krakauer became famous as an adventure writer of such books as 'Into the Wild' and 'Into Thin Air' - and Conrad Anker is renowned for his ascents of perilous peaks.

This is no small problem. There is a lot of human excrement on Mount McKinley and when the peak's ice inevitably melts due to global warming, we all know that "waste" flows downhill!